What to know: Ebola

The deadliest Ebola outbreak in history is plaguing West Africa, where more than 7,000 people have now died. Liberia, Sierra Leone and Guinea are at the center of the outbreak, which has now also spread to Nigeria and the United States. Learn more about this deadly disease.

Hillary Clinton did not have a State Department email account while she served as America's top diplomat, a senior state department official said Monday, and instead used a personal email account during her four years on the job.